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Could be bent pivot. Endstone pushing on the pivot. Try jewels ON without the endstone.
Before stripdown to mainspring , Push any gear reachable, ever slightly, to supplement the spring's force,
Pour a pallat of lighter fluid on jewels when runing. Also on pallet arbor.
Are you sure impulse is in beat?
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If the shaft is too long. You can always pack it with these sorts of washers. The large black type in this photo. Its always better to be a bit long than short. Just make sure you have good clearance of the face and the glass.